Dynamic Model and Numerical Simulation for Synchronal Rotary Compressor

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Hui Zhou ◽  
Zongchang Qu ◽  
Hua Yang ◽  
Bingfeng Yu
Keyword(s):  
Relative Velocity ◽  
Rotation Angle ◽  
Structural Characteristics ◽  
Side Surface ◽  
Mechanical Efficiency ◽  
The Other ◽  
Rotary Compressor ◽  
Working Principle ◽  
Shaft Rotation Angle ◽  
Average Relative Velocity

The synchronal rotary compressor (SRC) has been developed to resolve high friction and severe wear that usually occur in conventional rotary compressors due to the high relative velocity between the key tribo-pairs. In this study, the working principle and structural characteristics of the SRC are presented first. Then, the kinematic and force models are established for the key components—cylinder, sliding vane, and rotor. The velocity, acceleration, and force equations with shaft rotation angle are derived for each component. Based on the established models, numerical simulations are performed for a SRC prototype. Moreover, experiments are conducted to verify the established models. The simulated results show that the average relative velocity between the rotor and the cylinder of the present compressor decreases by 80–82% compared with that of the conventional rotary compressors with the same size and operating parameters. Moreover, the average relative velocity between the sliding contact tribo-pairs of the SRC decreases by 93–94.3% compared with that of the conventional rotary compressors. In addition, the simulated results show that the stresses on the sliding vane are greater than those on the other components. The experimental results indicate that the wear of the side surface of the sliding vane is more severe than that of the other components. Therefore, special treatments are needed for the sliding vane in order to improve its reliability. These findings confirm that the new SRC has lower frictional losses and higher mechanical efficiency for its advanced structure and working principle.

Design and Thermodynamic Study of a Novel Two-Sleeve Rotary Compressor

2016 ◽  
Vol 818 ◽  
pp. 28-38
Author(s):  
Y.A. Alduqri ◽  
Md Nor Musa ◽  
Z.A.B. Ahmad
Keyword(s):  
Thermodynamic Analysis ◽  
Thermodynamic Model ◽  
Air Conditioning ◽  
Thermodynamic Study ◽  
The Other ◽  
Rotary Motion ◽  
Rotary Compressor ◽  
Compressed Gas ◽  
Working Principle ◽  
Swept Volume

This paper introduces a novel two-sleeve rotary compressor (TSRC) concept. The compressor mechanism is basically that of a rotary motion whereby the novelty lies in the usage of two rotating sleeves and a secured vane that has one end fixed to an outer sleeve and the other end to a rotor, respectively. The paper introduces the working principle and thermodynamic model of the TSRC compressor. The swept volume, the delivered pressure, the work and the power of the TSRC are formulated and analyzed. The compressor configuration and thermodynamic analysis are based on the 174 cm3.rev-1 swept volume with R134a as the compressed gas. The thermodynamic analysis reveals that the TSRC will perform well as refrigerant compressor and can be reliably adopted for refrigeration and air-conditioning applications.

Friction Analysis on Vane of an Existing and of a Novel Multi Vane Rotary Compressor

2013 ◽  
Vol 284-287 ◽  
pp. 763-767
Author(s):  
A.R. Sarip ◽  
M.N. Musa
Keyword(s):  
The Other ◽  
Rotary Compressor ◽  
Brushless Dc Motor ◽  
Dramatic Reduction ◽  
Brushless Dc ◽  
Inner Surface ◽  
Instantaneous Pressure ◽  
All Speeds ◽  
Friction Analysis ◽  
Angle Of Rotation

This paper presents results of a frictional analysis on a new rotating sleeve multi-vane rotary (RSMVR) compressor. The new five-vane rotary compressor is adapted from the existing concept of a rotating sleeve single-vane rotary (RSSVR) compressor, in which the extended rounded end of one vane is embedded into the inner surface of the sleeve which allows the vane to swing within a certain small angle. As the rotor rotates, this vane drives the sleeve which in turn pushes and pulls the vane into and out of the slot in the rotor, respectively. The other four vanes are similarly pushed into the respective slots in the rotor but slide out only when a sufficient centrifugal force is developed. The driving vane ensures that suction, compression and discharge of the gas occur at all speeds of rotation. Although the sleeve rotates along, due to eccentricity between the rotor and the sleeve, each tip of the four vanes still rubs against the inner surface of the sleeve. The focus of the present study limits its analysis on to only frictions between the vane tip and the inner surface of the sleeve and between the vane sides and the respective slot walls. The frictional analysis is carried out by first determining the instantaneous pressure inside the compression cell and all the associated forces that exist. This involves an analysis on the dynamics of each vane when it reciprocates and at the same time rotates eccentrically with the sleeve. The kinematics of the vane are modelled using cosine and sine rules taking the cell leading vane as a reference to the angle of rotation. In the operation the model estimates a dramatic reduction in friction which is up to 82% lower than that occurs in an existing design of an equivalent conventional multi-vane rotary compressor (MVR). A friction between the rotating sleeve and the two opposite end plates exists in the RSMVR compressor but does not in that of the MVR. This will be included in a later study but on a new integrated brushless DC motor RSMVR compressor concept and on that of the existing shaft driven MVR, to see the overall difference in the frictions exerted.

On the factorization of rotations with examples in diffractometry

1990 ◽  
Vol 428 (1875) ◽  
pp. 451-472 ◽  
Keyword(s):  
Rotation Angle ◽  
Rotation Axis ◽  
Axial Direction ◽  
The Other ◽  
Rotation Vector ◽  
Coordinate Transformations ◽  
Rotation Axes ◽  
Analytic Expressions ◽  
Direction Cosines

An analysis of compound rotations, such as occur in eulerian cradles, is presented in terms of a calculus of rotation axes, without reference to the associated coordinate transformations. The general case of three rotation shafts mounted on one another, with any relation between them at datum zero, is presented. The problem and its solution may be represented entirely in terms of a plane octagon in which four sides have directions that are instrumental constants and the other four sides have lengths that are instrumental constants. When the first four sides are given lengths that express both the rotation angle and the axial direction of the required rotation, then the remaining four sides have directions that directly express the rotations in the drive shafts, that will generate the required rotation. Analytic expressions are given for the shaft setting angles in the general case. If the first and third axes are parallel and the intermediate one perpendicular to these at datum zero (as in the four-circle diffractometer) then these reduce to θ 1 = arctan ( μ, σ ) + [arctan ( λ , v ) - ψ -½8π], θ 2 = 2 s arcsin ( λ 2 + v 2 )½, θ 3 = ( μ, σ ) - [arctan ( λ , v ) - ψ - ½8π], s = ± 1, 0 ≤ arcsin ( λ 2 + v 2)½ ≤ ½π, in which λ, μ, v and σ are the four components of a rotation vector constructed such that λ, μ and v are the direction cosines of the rotation axis multiplied by sin½ θ for a rotation angle θ and σ is cos½ θ . ψ is a constant determined by the choice of directions to which λ and v are measured. The results for the general case are also expressed in terms of more conventional variables.

Ductile Crack Propagation Simulation of a Cylinder With a Through-Wall Circumferential Flaw Under Excessive Cyclic Torsion Loading

2014 ◽  
Author(s):  
Kiminobu Hojo ◽  
Daigo Watanabe ◽  
Shinichi Kawabata ◽  
Yasufumi Ametani
Keyword(s):  
Cyclic Loading ◽  
Crack Growth ◽  
Rotation Angle ◽  
Fe Analysis ◽  
The Other ◽  
J Integral ◽  
Ductile Crack ◽  
Elastic Plastic ◽  
Cyclic Torsion ◽  
Ductile Crack Growth

A lot of applications of elastic plastic FE analysis to flawed structural fracture behaviors of mode I have been investigated. On the other hand the analysis method has not been established for the case of the excessive cyclic torsion loading with mode II or III fracture. The authors tried simulating the fracture behavior of a cylinder-shaped specimen with a through-walled circumferential flaw subjected to excessive monotonic or cyclic loading by using elastic plastic FE analysis. Chaboche constitutive equation of the used FE code Abaqus was applied to estimate the elastic plastic cyclic behavior. As a result in the case of monotonic loading without crack extension, the relation of torque-rotation angle of the experiment was estimated well by the simulation. Also J-integral by the Abaqus’ function agreed with a simplified J-equation using the calculated torque-rotation angle relation. On the other hand under load controlled cyclic loading associated with ductile crack growth, the calculated torque-rotation angle relation did not agree with the experimental one because of high sensitivity of the used stress-strain curve. J-integral from Abaqus code did not increase regardless of the accumulated crack growth and plastic zone. Several simplified ΔJ calculations tried to explain the experimental ductile crack growth and it seemed that da/dN-ΔJ relation follows the Paris’ law. From these examinations an estimation procedure of the structures under excessive cyclic loading was proposed.

Mechanical Property of Internal Meshing Rotary Compressor

2015 ◽  
Vol 799-800 ◽  
pp. 760-764
Author(s):  
L. Huang ◽  
Y.L. Jiang ◽  
Y. Wang
Keyword(s):  
Mechanical Property ◽  
Rotary Compressor ◽  
Mechanical Parameters ◽  
Rotary Pump ◽  
Rotary Mechanism ◽  
Working Principle ◽  
Internal Meshing

The internal-meshing rotary mechanism is widely used in the oil pumps and cyclonical pin wheels application. The working principle of the internal meshing rotary compressor is very different with the current institutions applications. while, the mechanical property method of the internal meshing rotary pump can’t be entirely and directly used in the rotary compressor because of the different working principles. In order to simplify the study of the internal-meshing rotary compressors, the forces acted on the inner and outer gears are computed. The gas force and torque related to the rotating angle are derived, and then compared with other rotary compressors. The result shows that the internal meshing rotary compressor’s mechanical parameters vary periodically and the period is 2π/Z2and this type of compressor has perfect mechanical property compared with other compressors.

A Simulation Study on Translational Piston Air Compressor

2011 ◽  
Vol 328-330 ◽  
pp. 628-632
Author(s):  
Kui Hua Geng ◽  
Meng Tang ◽  
Hong Dong Yu ◽  
Ai Nong Geng ◽  
Shi Guang Du
Keyword(s):  
Simulation Study ◽  
Relative Velocity ◽  
Friction And Wear ◽  
Kinetic Characteristic ◽  
Translational Motion ◽  
Piston Compressor ◽  
Working Principle ◽  
Rolling Piston ◽  
Rotary Speed ◽  
Conventional Rolling

The structure and working principle of a new translational piston compressor was introduced in this paper. Its piston works in a way of translational motion, hence reduces the piston’s relative velocity to cylinder and cap, as well as friction and wear. In order to avoid vane detaching from piston, simulations were carried out regarding the pre-tightening spring and an optimal preload of the spring was obtained. By analyzed and compared to conventional rolling piston compressor in term of contact force between vane and piston, it was pointed out that the new compressor possessed advantage of kinetic characteristic and is more suitable for the situation of high rotary speed.

Reform of Entrance Sealing Device of Large Vertical Reduction Annealing Furnace

2012 ◽  
Vol 562-564 ◽  
pp. 821-824
Author(s):  
Yao Dong Cen ◽  
Lin Chen
Keyword(s):  
Structural Characteristics ◽  
Sheet Steel ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Stable Operation ◽  
Annealing Furnace ◽  
Roller Surface ◽  
Reduction Annealing ◽  
Working Principle ◽  
Condensed Water

Against the problem of roller surface nodular of Baotou sheet steel factory galvanized vertical reduction annealing furnace, products defects of dezincification, leak plating, scratches before galvanized and so on, and from these aspects of analysis including the vertical annealing furnace’s working principle and structural characteristics, it was found that these main reasons causing this fault was that entry seal roller did not turn for high temperature deformation and condensed water of roller surface pollute strip steel, by improving the design and transformation of entry seal structure, the defects which caused by these reasons is solved, greatly improved the quality of the products, and there for provide the safeguard for the continuous and stable operation galvanized units.

The Design of Yield Monitor Device of Tomato Harvester

2014 ◽  
Vol 602-605 ◽  
pp. 1782-1786
Author(s):  
Ming Chang Chen ◽  
Hong Wen Zhang
Keyword(s):  
Real Time ◽  
Theoretical Basis ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Working Environment ◽  
Yield Monitor ◽  
Technical Requirements ◽  
Working Principle ◽  
Monitor Device ◽  
Yield Monitoring

To solve the problem that yield monitoring cannot be done in real time during tomato harvesting in existing technology, a real-time yield monitor device on tomato harvester is designed by an three-dimensional software which is named Solidworks. This article describes the all structural characteristics and working principle of the device. Weighing belt, rollers and three kinds of sensors of the device are mainly designed and selected based on the working environment and technical requirements. The design of yield monitor device promotes popularization of the technology of tomato harvesting yield monitor on tomato harvesting machinery, makes the process of yield monitor in real time during tomato harvest realize automated, intelligently and informationized and provides a theoretical basis for the further study of tomato harvester monitoring technology.

Numerical Simulation of Heat and Fluid Flow in a Basic Pulse-Tube Refrigerator

2004 ◽  
Author(s):  
Takao Koshimizu ◽  
Hiromi Kubota ◽  
Yasuyuki Takata ◽  
Takehiro Ito
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Surface Heat ◽  
Physical Models ◽  
The Other ◽  
Pulse Tube ◽  
Working Principle ◽  
Pulse Tube Refrigerators ◽  
Heat And Fluid Flow

The working principle of refrigeration in basic pulse-tube refrigerators (BPTR) has been explained by the mechanism called surface heat pumping (SHP) that heat is conveyed from the cold end to the hot end of the pulse tube by the successive heat exchange between the working gas and the wall. In this study, a numerical simulation has been performed to clarify the effect of the wall in BPTRs by comparing the numerical results in two physical models; one is the model considering the heat exchange between the working gas and the wall (HE model), and the other is the model ignoring that (AW model). As a result, the importance in the effect of the wall was shown clearly. In addition, the mechanism of refrigeration other than the SHP was made clear in the AW model.

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